Rotary valve for explosive-engines



A. MOLSTAD.

ROTARY VALVE FOR EXPLOSIVE ENGINES.

APPLICATION FILED IULY I01 19H.

Patented Dec. 30,1919.

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JQTOB N EY A. MOLSTAD.

ROIARY VALVE FOR EXPLOSIVE ENGINES.

APPLlCATlON FlLED JULY 10.1917.

1 326,682. I Patented Dec. 30, 1919.

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INVENTOR WITNESSES BY fiduw v %;i ATTORNEY ALFRED MOLSTAD, OF DEDHAM, IOWAL ROTARY VALVE FOR EXPLOSIVE-ENGINES.

Application filed July 10, 1917.

To all whom it may concern.-

Be it known that I, ALFRED MOLSTAD, a citizen of the United States, residing at Dedham, in the county of Carroll and State of Iowa, have invented certain new and 1136-,

ful Improvements in Rotary Valves for EX- and an exhaust.

Another object of the invention is to so construct the valve so that the cylinders may be caused to operate in timed relation and to further so construct this valve that leakage will be prevented.

Another object of the invention is to so construct this valve that the exhaust and the inlet will not interfere with each other or cause the valve to be large or cumbersome.

Another object of the invention is to provide a rotary valve which is so constructed that it may be placed on top of the engine where it will be out of the way.

Another object of the invention is to so construct this valve that it may be operated from the driving shaft of the engine.

This invention is illustrated in the accompanving drawings, wherein 1 Figure 1 is a view showmg an engine in side elevation and provided with the improved valve,

Fig. 2 is a longitudinal sectional view through the improved valve and the upper portion of a two cylinder engine,

Fig. 3 is a view showing the valve cyl1n der in section and the core in elevation,

Fig. 4 is a transverse sectional view through the valve taken along the line 4l4 of Fig. 2, and

Fig. 5 is a transverse sectional view taken along the line 5-5 of Fig. 2.

The engine in the accompanying drawing is a two-cylinder engine but it is to be understood that any number of cylinders could be provided and in case of a greater number of cylinders, it would simply be necessary to increase the length of the valve and dupli- Specification of Letters Patent.

Patented Dec. 30, 1919.

Serial No. 179,758.

cate the parts thereof. This engine is indicated in general by the numeral 10 and is provided with the cylinders 11 and 12 having the ports 13 which ports serve as inlets and as exhaust ports. It will thus be seen that the charge will be sucked in through the ports 13 and after being fired, the burnt gases will be forced out through these ports by the pistons. This engine is provided with the usual crank casing 1 1 and with a crank shaft 15 which extends beyond the end of the crank casing 14: and carries the fly wheel 16 and a pulley about which passes the belt or flexible drive 17 for a purpose to be hereinafter brought out.

The rotary valve is provided with a cylinder or body 18 mounted upon the engine and extending longitudinallythereof. This cylinder or body 18 is closed at its ends by the heads 19 and 20, the heads being provided with a center bearing 21 and the head 19 being provided with'a neck 'or conduit pipe 22 leading to the carbureter 23. The cylinder or body 18 inoloses the port 13 and is further provided with an exhaust port 24 from which leads the exhaust pipe 25.

In order to control the passage of the live gases and the burnt gases through the easing or cylinder 18, there has been provided a rotary valve provided with a tubular core 26 closed at one end and terminating in a stub shaft 27 and having its opposite end open and rotatably mounted in the sockets 28 of the head 19. Sleeves 29 and 30 are cast about the end portions of the core 26 and are provided with ports 31 registering alternately with the ports 13 for admitting live gas to the cylinders. The sleeves are further provided with ports 32" for permitting burnt gases to pass from the cylinders into the pockets or chambers 33. Both chambers 33 are in constant communication with a central annular channel 34 between the sleeves 29 and 30 and this channel in turn communicates constantly with the exhaust port 24. Grooves 35 are provided to carry lubricating oil thus permitting the core to rotate easily.

When this engine is in operation, rotation of the engine shaft will transmit rotary movement to the stub shaft 17 through the medium of the belt 17 which passes about pulley wheels carried by the crank shaft 15 and the stub shaft 27 and this will cause the core to rotate thus bringing the inlet ports 31 and exhaust ports 32 alternately the exhaust stroke, the port 32 Will register with the port 13 and the burnt gases Will be driven out of the cylinder and through the ports v32 into the chamber 33 and will then pass from this chamber into the space 3% and through the exhaust pipe 25. It Will thus beseen that a very efficient valve has been provided and it will be further seen that when it is desired to clean this valve, it willsi'n'iply be necessary, to remove'the heads 19and20 thus pern'iitting the core to be drawn out of the casing or cylinder 18. It should be further notedthat the rotation of this valve core will cause the carbon to be prevented from accummulating as. the carbon will be cut from about the upper ends of the ports 13 and will be carried out with the exhaust. Therefore a tight valvewill always be provided and leakage will be prevented from accumulated. carbon.

It willirbe furtherlnoted that byhaving the exhaust gases passing about the tube26, the live gases Will'be heated just prior, to entering the cylinders, thus causing a good combustion and further permitting a low grade of fuel such as kerosene to be used.

What is claimed is The combination with a pair of engine cylinders having ports in their upper ends, and a cylindrical valve casing overlying said cylinders; of a rotory valve mounted in said casing and having a stub shaft extending through one end thereof, the-valve comprising a tubular core opening out the other end of the valve and communicating with a source of combustible mixture supply, and sleeves fast around said core and having ports respectively opening through them into the interior ofthe core at diametrically opposite points and adapted to communicatewith the cylinders alternately, the shells of the sleeves also having diametrically opposite outlet ports communicating with the chambers around said core, and the valvehavingan annular channel at its midlength communicating constantly with both. said chambers and; with an exhaust port, and meansrapplied-to said stub shaft for" rotating the valve.

In testimony whereof I affix my vsignature in presence of twowitnesses.

ALFRED MOLSTAD. Witnesses F; A; Toovnn THOMAS DAVIS. 

